[{"id":60253,"question":"Xc =","choices":[{"text":"1/2πfc","value":"A"},{"text":"2πfc","value":"B"},{"text":"2π/fc","value":"C"},{"text":"fc/2π","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":60252,"question":"The internal resistance of a capacitor is called:","choices":[{"text":"Impedance","value":"A"},{"text":"Resistance","value":"B"},{"text":"Reactance","value":"C"},{"text":"Conductance","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":60250,"question":"In A.C circuit through a capacitor which one is:","choices":[{"text":"Current leads voltage by 90<sup>∘</sup>","value":"A"},{"text":"Current lags behind voltage by 90<sup>∘</sup>","value":"B"},{"text":"Both will be in phase","value":"C"},{"text":"None of above&nbsp;","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":60248,"question":"In purely resistive A.C circuit, instantaneous value of voltage and current:","choices":[{"text":"Current lags behind voltage","value":"A"},{"text":"Current leads voltage by&nbsp;π/2","value":"B"},{"text":"Both are in Phase","value":"C"},{"text":"Voltage leads current by Pase&nbsp;θ=π/2","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":60246,"question":"Vrms =","choices":[{"text":"0.7V<sub>∘</sub>","value":"A"},{"text":"<div>0.07V<sub>∘</sub></div>","value":"B"},{"text":"0.007V<sub>∘</sub>","value":"C"},{"text":"0.75V<sub>∘</sub>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":60245,"question":"The highest value reached by the voltage or current is one cycle is called:","choices":[{"text":"Peak to peak value","value":"A"},{"text":"Peak value","value":"B"},{"text":"<div>Instantaneous value</div>","value":"C"},{"text":"Root mean square value","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":60243,"question":"The main reason for world wide use of A.C is because:","choices":[{"text":"It is very high power&nbsp;","value":"A"},{"text":"It can be transmitted over long distance","value":"B"},{"text":"It is cheaper to use","value":"C"},{"text":"ALl of above","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":2434,"question":"The electromagnetic spectrum contains","choices":[{"text":"Radio waves","value":"A"},{"text":"X-rays","value":"B"},{"text":"Microwaves","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":2433,"question":"In frequency modulation, the amplitude of carrier waves is","choices":[{"text":"Increases","value":"A"},{"text":"Remains constant","value":"B"},{"text":"Decreases","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":2432,"question":"Radio frequency choke is","choices":[{"text":"Iron cored","value":"A"},{"text":"Air Cored","value":"B"},{"text":"Air as well as iron cored","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":2431,"question":"At high frequency, the current through a capacitor is","choices":[{"text":"Small","value":"A"},{"text":"Infinity","value":"B"},{"text":"Zero","value":"C"},{"text":"Large","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":2430,"question":"The effective value of any sinusoidal alternating current or voltage is","choices":[{"text":"","img":"2430_10-a.jpg","value":"A"},{"text":"","img":"2430_10-b.jpg","value":"B"},{"text":"","img":"2430_10-c.jpg","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":2429,"question":"The reactance of inductor depends upon","choices":[{"text":"L","value":"A"},{"text":"","img":"2429_9-b.jpg","value":"B"},{"text":"","img":"2429_9-c.jpg","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":2427,"question":"The natural frequency of L.C circuit is equal to","choices":[{"text":"","img":"2427_8-a.jpg","value":"A"},{"text":"","img":"2427_8-b.jpg","value":"B"},{"text":"","img":"2427_8-c.jpg","value":"C"},{"text":"","img":"2427_8-d.jpg","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":2424,"question":"The unit of impedance is","choices":[{"text":"Farad","value":"A"},{"text":"Henry","value":"B"},{"text":"Tesla","value":"C"},{"text":"Ohm","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":2423,"question":"In case of capacitor, the unit of reactance is","choices":[{"text":"Farad","value":"A"},{"text":"Ohm","value":"B"},{"text":"Newton","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":2422,"question":"The reactance is the ratio of","choices":[{"text":"V<sub>rms</sub>/I<sub>rms</sub>","value":"A"},{"text":"V<sub>rms</sub> x I<sub>rms</sub>","value":"B"},{"text":"I<sub>rms</sub>/V<sub>rms</sub>","value":"C"},{"text":"V<sub>max</sub> x V<sub>rms</sub>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":2420,"question":"The peak to peak value of alternating voltage is","choices":[{"text":"2V<sub>o</sub>","value":"A"},{"text":"V<sub>o</sub>","value":"B"},{"text":"","img":"2420_4-c.jpg","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":2419,"question":"The value of capacitive reactance is given by","choices":[{"text":"Xc = VI","value":"A"},{"text":"xc= 1/wc or xc= wL","value":"B"},{"text":"xc= 1*wc or xc=Lw","value":"C"},{"text":"All of above","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":2417,"question":"If I<sub>o</sub>&nbsp;is the peak value of current, then its root mean square value is given by","choices":[{"text":"","img":"2417_2-a.jpg","value":"A"},{"text":"2 I<sub>o</sub>","value":"B"},{"text":"I<sub>o</sub>","value":"C"},{"text":"0.7 I<sub>o</sub>","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":2415,"question":"<span style=\"font-family: tahoma, Arial, Helvetica, sans-serif; font-size: 12px;\">If V<sub>rms</sub> be the root mean square value of emf then its peak to peak value is given by</span>","choices":[{"text":"","img":"2415_1-a.jpg","value":"A"},{"text":"","img":"2415_1-b.jpg","value":"B"},{"text":"","img":"2415_1-c.jpg","value":"C"},{"text":"","img":"2415_1-d.jpg","value":"D"},{"value":"E"}],"correctAnswer":2}]